Galatians 6:4 in the King James Version
But let every man prove his own work, and then shall he have rejoicing in himself alone, and not in another.
Context
3 For if a man thinks himself to be something when he is nothing, he deceives himself.
4 But let each man examine his own work, and then he will have reason to boast in himself, and not in someone else.
5 For each man will bear his own burden.